How often should I change my water filter?
If your refrigerator has a water filter status light, replace the filter when the status light changes to red or when water flow decreases noticeably. If your refrigerator does not have a status light, you should change the water filter every 6 months depending upon your usage, or more often if water flow decreases before 6 months have passed.
From the official Whirlpool Refrigerator manual, page 6
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